Making the Hubble's deepest images even deeper

Phys.org ^ | January 24, 2019 | Instituto de Astrofísica de Canarias

[Red Badger]

The rate of expansion is increasing because as the ‘parts’ fly farther and farther away from each other, the drag force of gravity gets less and less........................

[from occupied ga]

The actual universe is larger than the observable universe

We analyze the state space of a Bianchi-I universe with anisotropic sources. Here we consider an extended state space which includes null geodesics in this background. The evolution equations for all the state observables are derived. Dynamical systems approach is used to study the evolution of these equations. The asymptotic stable fixed points for all the evolution equations are found. We also check our analytic results with numerical analysis of these dynamical equations. The evolution of the state observables are studied both in cosmic time and using a dimensionless time variable. Then we repeat the same analysis with a more realistic scenario, adding the isotropic (dust like dark) matter and a cosmological constant (dark energy) to our anisotropic sources, to study their co-evolution. The universe now approaches a de~Sitter space asymptotically dominated by the cosmological constant. The cosmic microwave background anisotropy maps due to shear are also generated in this scenario, assuming that the universe contains anisotropic matter along with the usual (dark) matter and vacuum (dark) energy since decoupling. We find that they contribute dominantly to the CMB quadrupole. We also constrain the current level of anisotropy and also search for any cosmic preferred axis present in the data. We use the Union~2 Supernovae data to this extent. An anisotropy axis close to the mirror symmetry axis seen in the cosmic microwave background data from Planck probe is found

What he said :-) from this

[Red Badger]

What he said is:

They used radio frequency power measurements aimed in different directions, from Earth in a spherical array, and used math to determine the ‘speed’ of the ‘fixed points’ in relation to Earth, taking into account the speed of light and time relationships with respect to us.

I think...............

[from occupied ga]

>An anisotropy axis close to the mirror symmetry axis seen in the cosmic microwave background data from Planck probe is found

I THINK what this means is they couldn't measure any curvature.

[Red Badger]

An anisotropy axis close to the mirror symmetry axis seen in the cosmic microwave background data from Planck probe is found

I think what this means is they found the long axis to be nearly the same as the short axis, so its close to spherical. Probably slightly ellipsoid. Which would fit my theory a little. As time goes by the perturbations would get worse and worse........................................

[reed13k]

Except they know the direction the expansion came from so they have calculated a “center” so to speak.

I’m trying to remember if it was a National Geographic OR one of my astronomy books that has an amazing fold out that shows relatively distance wise where everything was that we had discovered so far.

Darn - now I’ll be spending part of the weekend trying to find that as I want to look at it again.

[TXnMA]

"So the universe is bigger than the universe?.................."

Cute... '-)

The total universe is bigger than our observable universe (since all information reaching us is limited by the speed of light).

TXnMA
 

[Larry Lucido]

So the universe is bigger than the universe?..................

It's bigger than it appears in your rear-view mirror.

[minnesota_bound]

If the astronomers look far enough they will see the back of their heads....